OOOh pinterest! So many cute ideas on there!!! Unless you specifically want something I wouldn't worry about giving people an idea of what to get - I wanted a Grobag and got 2 of those from family but everything else was what people wanted to get us! Was much more fun not knowing what they were getting!

Other game things that you could do that are not too silly or gimmicky is a little tips for mum book where people write little handy hints for you and also have seen printed out slips with things like Dreams for Baby and they write things like I hope you get.. I hope you love... I hope you never forget... etc. they are cute and can be kept and bound for bub in a memory box.
Have fun planning!